Toyota Sequoia (2005). Manual - part 208

–

DIAGNOSTICS

AUTOMATIC TRANSMISSION

DI–627

821

Vehicle speed 

(During transition from 4th to 5th gear)

–

Less than 100 km/h (62.2 mph)

ON malfunction (E)

ECM selected gear

5th

Engine speed – Turbine speed (NE – NT)

(After transition from 4th to 5th gear)

–

Less than 150 rpm

Vehicle speed 

(After transition from 4th to 5th gear)

–

Less than 100 km/h (62 mph)

TYPICAL MALFUNCTION THRESHOLDS

Detection criteria

Threshold

Both of the following conditions are met:

ON

lf

ti

(A)

d (B)

ON

lf

ti

(C)

 

ON malfunctions (A) and (B), or ON malfunction (C)

 

ON malfunction (D) or (E)

ON malfunction (A)

Turbine speed/Output speed

3.30 to 7.50

ON malfunction (B)

Turbine speed/Output speed

1.28 to 1.53

ON malfunction (C)

Turbine speed/Output speed

0.93 to 1.07

ON malfunction (D)

Turbine speed – Output speed x 4th gear ratio 

(NT – NO x 4th gear ratio)

1,000 rpm or more

ON malfunction (E)

Turbine speed – Output speed x 5th gear ratio 

(NT – NO x 5th gear ratio)

1,000 rpm or more

ECM command gearshift

Shift solenoid valve SL2

1st

2nd

3rd

4th

5th

OFF

ON

ON

ON

ON

DI–628

–

DIAGNOSTICS

AUTOMATIC TRANSMISSION

822

INSPECTION PROCEDURE

HINT:
Performing the ACTIVE TEST using the hand–held tester allows the relay, VSV, actuator and so on to oper-
ate without parts removal. Performing the ACTIVE TEST as the first step of troubleshooting is one method
to shorten labor time.
It is possible to display the DATA LIST during the ACTIVE TEST.
(a)

Warm up the engine.

(b)

Turn the ignition switch off.

(c)

Connect the hand–held tester to the DLC3.

(d)

Turn the ignition switch to the ON position.

(e)

Turn on the tester.

(f)

Select the item ”DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST”.

(g)

According to the display on the tester, perform the ”ACTIVE TEST”.

HINT:
While driving, the shift position can be forcibly changed with the hand–held tester.
Comparing the shift position commanded by the ACTIVE TEST with the actual shift position enables you
to confirm the problem (See page 

DI–567

).

Item

Test Details

Diagnostic Note

SHIFT

[Test Details]

Operate the shift solenoid valve and set each shift position by yourself.

[Vehicle Condition]

Less than 50 km/h (31 mph)

[Others]



Press ”

→

” button: Shift up



Press ”

←

” button: Shift down

Possible to check the operation of

the shift solenoid valves.

HINT:



This test can be conducted when the vehicle speed is 50 km/h (31 mph) or less.



The 4th to 5th up–shiftings must be performed with the accelerator pedal released.



The 5th to 4th down–shiftings must be performed with the accelerator pedal released.



Do not operate the accelerator pedal for at least 2 seconds after shifting and do not shift successively.



The shift position commanded by the ECM is shown in the DATA LIST (SHIFT) display on the hand–
held tester.



The shift solenoid valve SL2 is turned on/off normally when the shift lever is in the D position:

–

DIAGNOSTICS

AUTOMATIC TRANSMISSION

DI–629

823

1

Check other DTCs output (in addition to DTC P0776).

PREPARATION:
(a)

Turn the ignition switch off.

(b)

Connect the OBD II scan tool or hand–held tester to the DLC3.

(c)

Turn the ignition switch to the ON position.

(d)

Turn on the tester.

(e)

Select the item ”DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES”.

CHECK:
Read the DTCs using the OBD II scan tool or the hand–held tester.
RESULT:

Display (DTC output)

Proceed to

Only ”P0776” is output

A

”P0776” and other DTCs

B

HINT:
If any other codes besides ”P0776” are output, perform troubleshooting for those DTCs first.

B

Go to DTC chart (See page 

DI–573

).

A

D12795

1

2

(–)

(+)

1

2

Shift Solenoid Valve SL2:

DI–630

–

DIAGNOSTICS

AUTOMATIC TRANSMISSION

824

2

Inspect shift solenoid valve SL2.

PREPARATION:
Remove the shift solenoid valve SL2 (See page 

AT–10

).

CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:

Tester Connection

Specified Condition

20



C (68



F)

1 – 2

5.0 to 5.6 

Ω

CHECK:
Connect the positive (+) lead with a 21 W bulb to terminal 2 and
the negative (–) lead to terminal 1 of the solenoid valve connec-
tor, then check the movement of the valve.
OK:

The solenoid makes an operating sound.

 

NG

Replace the shift solenoid valve SL2
(See page 

AT–10

).

OK

3

Inspect valve body 

(See page 

AT–10

).

OK:

There are no foreign objects on each valve.

NG

Repair or replace valve body.

OK

Repair or replace transmission (See page 

AT–25

).